Chain-stitch sewing-machine.



Patented Feb. I9, I91.

L. ONDERDONK. CHAIN STITCH SEWING MAGHINE.

(Application flled Nov. 9, 1897. Renewed Aug. 1-, 1900.)

(No Model.)

Moron, n, c.

I was cu. Pno'ra UNITED STATES 1 ATENT rricn.

LANSING ONDERDONK, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE UNION SPECIAL SEWING MACHINE COMPANY, OF CHICAGO, ILLINOIS.

CHAIN-STITCH SEWING-MACHINE.

SPECIFICATION formiig part of Letters Patent No, 668,539, dated February 19, 1901.

Application filed November 9, 1897. Renewed August 1, 1900. Serial No. 25,589. (No model.)

-ings and to the letters of reference marked thereon.

Myinvention relates to an improvement in sewing-machines, and especially to the class of chain-stitch sewing-machines inwhich an under-thread-carrying looper cooperates with a thread-carrying needle to form stitches.

The object of the invention is to provide an arrangement of mechanism whereby the looper may, if desired, have only the forward and backward movements instead of the usual four motions, and wherebyall danger of skipping stitches is avoided by the use of a spreader which seizes or moves against the looper-thread as the needle is about to come down and the looper about moving back and holds said thread at such an angle that the needle must pass down into its bight.

The invention consists in the matters hereinafter described, and referred to in the appended claims.

The invention is illustrated in the accom panying drawings, in which Figure 1 isa side elevation of so much of a sewing-machine as is necessary for a complete understanding of my invention. Fig. 2 is a cross-section on line 2 2 of Fig. 1; Fig. 3, a top view showing the relation of looper and spreader.

In the drawings, A represents the bed-plate of a sewing-machine of the chain-stitch type, and B the driving-shaft. The driving-shaft B is journaled at its forward end on the standard (1, attached to the bed-plate of the machine, and forward of its front or outer bearing has attached to it a pin or rod C, the outer end of which is provided with an eccentric I), while the portion adjacent the forward end of the shaft is bent, forming an inclined crank 0, attached to the projecting arm (1 on the collar or head 6 on the forward end of the main shaft.

Journaled to swing on its axis is a carrier D, having wingsf, which embrace the inclined crank 0, upon which carrier is supported in any suitable way a looper 0r loopers g.

The loop-spreader h, as herein shown, is supported on one of the arms of the rocking fork 7c in a socketi thereon, the fork at its lower end being sleeved on a stud Z, secured in a lug m on the bed of the machine. This rocking yoke is oscillated by means of the eccentric b on the straight portion of the pin or rod C, and thus in the rotation of the driving-shaft B the looper-carrier is oscillated in the direction of the length of the looper and the spreader oscillated sidewise to catch the looper-thread and deflect it, so that the needle n will go down into the bight of the looperthread.

Instead of giving the spreader an oscillating movement it maybe supported on a sliding bar which reciprocates back and forth in a right line.

Various minor modifications and changes in the construction of the parts of the device may be made without departing from the spirit of my invention, the leading feature of which is the inclined crank arrangement or inclined crank and eccentric arrangement which operates both the looper and the loopspreader.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is

1. In a sewing-machine, a driving-shaft, a looper and a spreader, and means for positively operating the said looper and spreader, said means including an inclined crank having adjacent to one end an eccentric, said looper and spreader being engaged the one by the crank and the other by the eccentric, and connections between the inclined crank and eccentric and the driving-shaft, substantially as described.

2. In a sewing-machine, a driving-shaft, an inclined crank and eccentric mounted on the forward end thereof, a looper and a spreader, each operated by one of said elements whereby they have positive movements, the one in the direction of its length and the other laterally across the line traversed by the other; substantially as described.

3. Ina sewing-machine, a driving-shaft, an

eluding an inclined crank operatively engag- IO ing one of said members; substantially as described.

In testimony whereof I afiix my signature in presence of two witnesses.

LANSING ONDERDONK.

Witnesses:

A. L. COOMBS, A. H. HATCH. 

